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Using the engine to drive something is going to result in lower MPG.
An exhaust driven alt falls into that catorgory.
Your only options are to carry more power with you, add a solar panel that doesn't mess up your aerodynamics or put something that uses free and clear waste heat to do work.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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